Cardiac monitor



FIG. 1 is an isometric view;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view, the back elevational view being identical;

FIG. 4 is a bottom plan view;

FIG. 5 is a right elevational view; and,

FIG. 6 is a left elevational view. 

The ornamental design for cardiac monitor, as shown and described. 